81790148 has 12 divisors (see below), whose sum is σ = 156144912. Its totient is φ = 37177320.

The previous prime is 81790147. The next prime is 81790151. The reversal of 81790148 is 84109718.

It is not an unprimeable number, because it can be changed into a prime (81790147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 929390 + ... + 929477.

It is an arithmetic number, because the mean of its divisors is an integer number (13012076).

Almost surely, 2^81790148 is an apocalyptic number.

It is an amenable number.

81790148 is a deficient number, since it is larger than the sum of its proper divisors (74354764).

81790148 is a wasteful number, since it uses less digits than its factorization.

81790148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1858882 (or 1858880 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 81790148 is about 9043.7905769649. The cubic root of 81790148 is about 434.0772229806.

The spelling of 81790148 in words is "eighty-one million, seven hundred ninety thousand, one hundred forty-eight".